Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received December 8, 2015; final manuscript received July 21, 2016; published online October 18, 2016. Assoc. Editor: Mark R. Duignan.

Abstract

The propagation and attenuation of pressure waves in highly dispersed gas–liquid flows are investigated in this work, and an indirect measurement method is proposed to assess the attenuation coefficient in short pipelines. Additionally, a mechanistic acoustic energy dissipation model is derived from the oscillatory solutions of one-dimensional (1D) nondimensionalized mass and momentum equations to facilitate the interpretation of the results. Tests were performed on a 1500 m long, 50 mm internal diameter pipeline in which pressure disturbances were induced by suddenly opening leak valves. The results are consistent and in good agreement with the proposed attenuation model (±10% for 103 < Re < 104), therefore validating the proposed model and indirect measurement method.

Figures

Schematic representation of the structure of a pressure signal sensed by a pressure probe placed at a distance ℓ from the inlet, in response to a pressure disturbance caused by opening a leak valve (negative pressure wave)

Examples of the temporal damping coefficient of the multiple echo signals measured by pressure sensors 4 and 6, respectively, up and downstream of leak valve 10 which was opened to generate the acoustic disturbance

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